I've had both happen on several occassions... when it is limp mode you will know it for sure because the motor / throttle will abruptly cut-out at a very specific RPM, but under that RPM it will work just fine
Whereas fuel starvation you lose all throttle regardless of RPM. It can be for just a moment, or it can be so severe that it last a few seconds... if it last a few seconds, you have a very good chance that the motor will turn off all together, which has also happened to me on the track
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